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        <p>Little tips and tricks in JavaScript, but often to use</p>
      
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        <p>To do clone for any object in JavaScript will not be simple or straightforward. You will run into the problem of erroneously picking up attributes from the object’s prototype that should be left in the prototype and not copied to the new instance. If, for instance, you are adding a clone method to Object.prototype, as someone depict, you will need to explicitly skip that attribute. But what if there are other additional methods added to Object.prototype, or other intermediate prototypes, that you don’t know about? In that case, you will copy attributes you shouldn’t, so you need to detect unforeseen, non-local attributes with the hasOwnProperty method.</p>
      
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        <p>Using tampermonkey to fill studylink automatically which used a lot of jquery api, this is a good backup to remind the usage of  a practical scenario.<br>
      
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        <p><img src="/img/js_proto_chain.png" alt="JavaScript proto chain"><br>There are several answers here how to check if a property exists in an object.</p>
<p>I was always using</p>
<p>if(myObj.hasOwnProperty(‘propName’))<br>but I wonder if there is any difference from<br>if(‘propName’ in myObj){</p>
      
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        <p>NSNumber and NSDictionary are the basic class and most useful class in objective c.<br>
      
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        <p>在使用polyv的web上传插件时遇到语言问题，官方插件是中文没有切换英文的借口。想到保存到本地修改后使用。<br>幸好提供了jsonp借口，但是在调用上踩了一下坑。<br>
      
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        <p>自执行函数写法很诡异，mark一下，需要学习。<br>
      
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        <h1 id="Promise-Simple-Example"><a href="#Promise-Simple-Example" class="headerlink" title="Promise Simple Example"></a>Promise Simple Example</h1><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">timeout</span>(<span class="params">ms</span>) </span>&#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">new</span> <span class="built_in">Promise</span>(<span class="function">(<span class="params">resolve, reject</span>) =&gt;</span> &#123;</span><br><span class="line">    setTimeout(resolve, ms, <span class="string">'done'</span>);</span><br><span class="line">  &#125;);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">timeout(<span class="number">100</span>).then(<span class="function">(<span class="params">value</span>) =&gt;</span> &#123;</span><br><span class="line">  <span class="built_in">console</span>.log(value);</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>
      
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